Obama has designated nearly three times more land and water than any other president since Congress first passed the Antiquities Act in 1906, according to the White House.
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President Obama designated nearly 347,000 acres of California’s San Gabriel Mountains a national monument on Friday, vowing that he is “not finished” preserving the nation’s wilderness.

Obama has designated 13 such monuments during his presidency, protecting a total of 260 million acres of both land and water, and sparking outrage from Republicans in Congress.

“Within these hills lies a millennia of history. Just as this region teaches us about our past it offers us a window into the future,” Obama said at an event in Los Angeles County.